test_subprocess is far too slow

[mwhudson]

BPO	1124637
Nosy	@mwhudson, @tim-one, @birkenfeld

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2005-03-04.10:17:14.000>
created_at = <Date 2005-02-17.11:10:13.000>
labels = ['library']
title = 'test_subprocess is far too slow'
updated_at = <Date 2005-03-04.10:17:14.000>
user = 'https://github.com/mwhudson'

bugs.python.org fields:

activity = <Date 2005-03-04.10:17:14.000>
actor = 'mwh'
assignee = 'astrand'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2005-02-17.11:10:13.000>
creator = 'mwh'
dependencies = []
files = []
hgrepos = []
issue_num = 1124637
keywords = []
message_count = 10.0
messages = ['24321', '24322', '24323', '24324', '24325', '24326', '24327', '24328', '24329', '24330']
nosy_count = 5.0
nosy_names = ['mwh', 'tim.peters', 'anthonybaxter', 'georg.brandl', 'astrand']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1124637'
versions = ['Python 2.4']

[mwhudson]

test_subprocess takes multiple minutes. I'm pretty
sure it's "test_no_leaking". It should either be sped
up or only tested when some -u argument is passed to
regrtest.

[astrand]

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Tell me a bit about your type of OS and hardware. On my
machine (P4 2.66 GHz with Linux), the test takes 28 seconds.

[mwhudson]

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Bog standard linux pc -- p3 933, 384 megs of ram.

"$ time ./python ../Lib/test/regrtest.py test_subprocess"
reports 2 minutes 7. This is a debug build, a release build
might be quicker. A run of the entire test suite takes a
hair over nine minutes, so 20-odd % of the time seems to be
test_subprocess.

It also takes ages on my old-ish ibook (600 Mhz G3, also 384
megs of ram), but that's at home and I can't time it.

[anthonybaxter]

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I'm with mwh. This test should be enabled with an option -
I'd noticed that test_subprocess took a long time, but
hadn't bothered to track it down.

Before releases (and at other times) I always try to make
sure that I run 'make testall', but for day-to-day use, this
is too slow.

[tim-one]

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Peculiar -- test_subprocess takes about 8 seconds on my
WinXP box release build, about 10 seconds debug build, and
Windows is notorious for slow process creation. That's a
zippy 3.4 GHz P4, but clock rate alone can't account for such
a large speed difference.

[astrand]

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tim_one: test_subprocess only creates 65 processes on
Windows, compared to 1026 for UNIX.

[astrand]

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Fixed in HEAD revisions:
regrtest.py: 1.166
1.19

Fixed in 2.4 revisions:
regrtest.py: 1.165.2.1
test_subprocess.py: 1.15.2.2

[birkenfeld]

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Shouldn't it be closed then?

[astrand]

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Forgot to close.

[mwhudson]

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Thank you!